Reduce the unstable noise in the mobile phone
The porter moving knows the role who the voice quality acted while users keep. A main factor of influencing the sound quality is a environmental noise; So, any method to inhibit noise offers potential differentiator to mobile phone manufacturer.
Until recently, the noise in the mobile phone inhibits technology and concentrates on reducing the slow steady noise source that changes. However, the unstable noise source is changing and not constraining rapidly. So, users can’t use their mobile phone on the busy street reliably, in the crowded restaurant or even at home.
Inhibit the unstable noise and bring the real advantage to users and the porter. No matter in where want by they, user obtain freedom clear, speak and hear, through speaking in the noise environment lightly and lightly, and the personal secrets that will not be demanded to leave the important teleconference and like to increase. What the porter saw in user’s agitator is cut down, increase the time usage of radio, more effective use of the network bandwidth, and important deposit of the capital and cost of operation.
9 steps of this article outline reduce the unstable noise in the mobile phone.
Understand the difference, regarded as a loud ball in backgroundtationary noise the stability in its relatively invariable natureuch and unstable noiseecause The fan is reduced through commonly used signal treatment technology easily to realize and effectively. Unstable noise, but with rapidly or as characteristic, first people that talk random change, background music or keyboard type. When considered to be the noise in unstable noising, it has already been passed, and so many complicated noises inhibit technology from being required even more.
Use two microphone improvement understand sceneext of sense of hearing take the place of noise inhibit technology, for example scenery of sense of hearing analyze (A Sa) ,The roof beam is formed and separated(BSS) with the blind source Use many microphones to appraise more accurately even more, it becomes possible compared with source group of the noise because of single microphone to find. The mobile phone manufacturer has recognized this trend and already begun to lead the 2nd microphone into the mobile phone building.
Use, sort out principle interestrouping technology to separate voice in make, determine unstable noise source simplify noise inhibit from might become. A Sa, for example listen to according to people concrete way of sound use people path of sense of hearing as one model and course noise. Recreate the original sound through the energy of sorting out sound, A Sa make accurate group of voice become possible from a lot of source while be thought mediation of the single sound to avoid any. Sorting out the principle may be described into a order widely (cross those operated in time) And at the same time(cross those that frequency is operated) .
Use many hint sort out hint sort out sound correctlyach difficult to have, restrain from like this sorting out. Use a lot of to suggest not making the sound of difficult analysis can be sorted out correctly like this. Important some suggested including throws space information and attacks time.
Ones that produce from a sound source thrown and acoustics form the clear frequency pattern, can be used for distinguishing a sound and another one. Distinguish men and a main hint of women voice in pitch.
Used for sorting out the sound in a space informationhe position based on its distance and sound of directionan, so distinguish and hold they and sounds cared about.
When two corresponding and acoustics of breaking out and them of the sound energy has the attack time similarly, it is possible from the same source for them.
Will collect time and must reduce the first convergence to inhibit technology before they can remove the noise in suitable more instant noise removalraditional noises, make them suppress the unstable noise source invalid. While using and performing and suggesting describing the sound quickly, even, the instant incident for example a finger is gripped suddenly and can be determined and removed.
Employ logarithm line frequency scaleshe familiar with FFT decompose frequency line scale restrain spectrum from solve in low frequency and use an invariable frame of size and frequency independent bandwidths Spare part. On the contrary, a method like quick acoustic labyrinth changes (FCT) The characteristic based on people’s acoustic labyrinth is operated on a frequency scale of logarithm. So, it does not limit the decision of the spectrum. Through instead of operating in the frame continuously, FCT reduces and deals with hiding too, make it suitable for appraising the unstable noise source. FCT rely on bandwidth manage, can hear frequency of people of range match each time with time frequency trade clearly together with frequency too.
Service orientation microphone of omni cut roof beam that form alike, need specialized cardioid (one-way) Like that costechniques microphone. Cardioid microphone spends more than the microphone in the direction omni, there is more urgent tolerance, must be differentiated check-up and inclusive and suitable for 1 decibel, because to the sensitiveness of the wind and breeze, introduces to the restriction of separating, and +12 decibels of noises altogehter. The roof beam formed is passed in the restricted part of regarding quilt as sounds cared about in any distractors in the light beam cared about incorrectly too.
The quantity of managing microphone that a system needs is important too. For example, BSS line technology simple to use, run bestly in the presence of as the rational source as a lot of microphone at least.
Regard echo as independent sound sourcesraditionally, the echo is used the single echo to cancel technology to remove. When they must calculate the echo reflect and offer inferior performance on condition that change the noise source rapidly, such technology may concentrate on being calculated. Sort out and suggest enabling the echo to be only regarded as another noise source. Inhibit from, become perhaps immediately because the echo did not need to be calculated it is not they that changed lanes, offer and send upward inhibition performance 46 decibels.
Industry that standardshe tested newly to adopt flow continue, make standard of testing through inhibit innovation of respect reflect sound high competence of quality in noise. For high-quality their product assurance, industry revise International Telecommunications Union page 835 prove already recently for with enliven noise inhibit technology measure and report voice quality offer identical examination method learn.
The effective inhibition of the environmental noise, steady and unstable, if mobile phone manufacturer and porter catch up with their competitor, it is essential. Inhibit the technological developer and can be getting and reducing the noise level in 25 decibels of mobile phones operated under the condition on a large scale through utilizing the noise of future generation.
August 1st, 2009 at 1:45 am
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